BEE Bachelor of Electrical Engineering Electric Circuit Analysis Questions and Answers

Question 1

According to the superposition theorem, to find the contribution of a single current source in a linear circuit with multiple sources, all other sources must be:

Accepted Answer

Voltage sources replaced by short circuits and current sources by open circuits.

Answer

Replaced by short circuits.

Answer

Replaced by open circuits.

Answer

Voltage sources replaced by open circuits and current sources by short circuits.

Question 2

A DC voltage source has a Thevenin equivalent voltage of 12V and a Thevenin equivalent resistance of 3Ω. To achieve maximum power transfer, what should be the value of the load resistance?

Accepted Answer

3Ω

Answer

12Ω

Answer

6Ω

Answer

9Ω

Question 3

In the context of nodal analysis, what is a 'supernode' used for?

Accepted Answer

To handle a voltage source connected between two non-reference nodes.

Answer

To simplify a circuit with only current sources.

Answer

To group all nodes connected to the ground reference.

Answer

To combine all parallel branches into a single equivalent branch.

Question 4

Which of the following correctly describes a Norton equivalent circuit?

Accepted Answer

A current source in parallel with a resistor.

Answer

A voltage source in series with a resistor.

Answer

A voltage source in parallel with a capacitor.

Answer

A current source in series with an inductor.

Question 5

A series RLC circuit is subjected to a step DC voltage input. If the response shows decaying oscillations before reaching a steady state, the circuit is said to be:

Accepted Answer

Underdamped

Answer

Critically damped

Answer

Overdamped

Answer

Undamped

Question 6

When calculating the Thevenin equivalent resistance (Rth) for a circuit containing independent sources, what is the correct procedure?

Accepted Answer

All voltage sources are replaced by short circuits and all current sources are replaced by open circuits.

Answer

All voltage sources are replaced by open circuits and all current sources are replaced by short circuits.

Answer

All sources are left active and the resistance is calculated across the output terminals.

Answer

Only voltage sources are replaced by short circuits; current sources remain active.